We consider two different communication scenarios, both with two
independent messages \(W_1\)  and \(W_2\) . In the first scenario (see
Fig. REF -(a)), message \(W_1\)  is intended for receiver 1
but needs to be kept secret from receivers 2 and 3, and message
\(W_2\)  is intended for receivers 1 and 2 but needs to be kept
confidential from receiver 3. In the second scenario (see
Fig. REF -(b)), message \(W_1\)  is intended for receivers 1
but needs to be kept secret from receiver receiver 3, and message
\(W_2\)  is intended for receivers 1 but needs to be kept secret from
receiver 3. The confidentiality of the messages at the unintended
receivers is measured using the normalized information-theoretic
criteria [1]}, [2]}:
\(&\frac{1}{n}I(W_1;\mathbf {Y}_2^n) \rightarrow 0, \quad \frac{1}{n}I(W_1;\mathbf {Y}_3^n) \rightarrow 0, \quad \text{and} \quad \frac{1}{n}I(W_2;\mathbf {Y}_3^n) \rightarrow 0 \) 
